michael@otago.ac.nz (04/05/91)
In article <1991Apr4.110055.235@otago.ac.nz>, stanger@otago.ac.nz (Nigel Stanger) writes: > In article <1991Apr3.023624.28536@en.ecn.purdue.edu>, scott@en.ecn.purdue.edu (Scott Kell) writes: > > Yes, this is the only disadvantage of an LC with System 7. I > wouldn't be too surprised however, if someone came out with a > plug-in board which had an MMU anyway (it will be third-party: no > joy from Apple! :-) I'm afraid this not easy to do. The LC has four 1Mx4 RAM chips soldered direct to the board with address lines going directly to them. An MMU of any sort would have to intercept those lines in order to modify them. Since the CPU is also soldered in this is virtually impossible. You would have to disable the onboard RAM entirely and substitute RAM behind an MMU on a card. Apart from the embarassing disappearance of 2Mbytes of RAM, such a card would have to further slow down the LC by adding a wait state. Surely people aren't *that* desperate for VM? Michael(tm) Hamel, Computing Services Centre, University of Otago, New Zealand PITSLIGO (n.) Part of traditional mating rite. During the first hot day of spring, all the men in the tube start giving up their seats to ladies and strap-hanging. The purpose of pitsligo is for them to demonstrate their manhood by displaying the wet patches under their arms.